This unit will cover approximately 2000 square feet (185 square metres) per tank full. The spray distance with the straight nozzle is approximately 40' (12 m). This unit requires approximately 3/4 - 1 bale of paper mulch, seed and fertilizer based on label rate to cover 2000 square feet (185 square metres). Hydroseeders have proven to work very well for applying compost tea as well. If you use for compost tea you might want to consider the Comjet Spray Gun.